Light. Motion.
A little experimentation.
Explore how aperture, shutter speed and ISO work together. Change one setting and follow what happens.
One scene. Three decisions.
Controls light-gathering time and motion blur.
Understand shutter speed ↗What this playground assumes
Fixed scene illumination, a 50 mm lens, focus distance, camera position and a steadily moving subject. The reference is f/4, 1/125 s, ISO 100. Relative light exposure is proportional to shutter time ÷ f-number². Displayed brightness uses a simplified linear ISO multiplier before the preview’s tone response.
Background blur, motion blur and grain are teaching approximations. Lower collected light increases the grain effect; an illustrative ISO contribution is also included. Real noise depends on the sensor, light, processing and output size. Highlights, depth of field, diffraction and camera shake are not calculated precisely. This is an illustration, not a prediction or light meter for a particular camera.
The stop relationships and qualitative effects were checked against Nikon’s exposure explanation, aperture guidance and Sony’s ISO explanation. Model version 1.0 · checked 3 October 2026.
Use Tab to reach a slider, then arrow keys to change it. The preview stays still and works with reduced-motion preferences.
Three ideas to take with you.
Aperture
The opening that influences the light reaching the sensor and the depth of field.
Shutter speed
The length of time light is recorded, and a key influence on motion blur.
ISO
A setting that influences displayed brightness and the noise trade-off. It does not put more light through the lens.